Which is bigger, the Four Fifty or the Six Sixty?

The Six Sixty is bigger at 660 sq ft, compared to 450 sq ft for the Four Fifty.

Which costs less, the Four Fifty or the Six Sixty?

The Four Fifty is the lower-priced option at $199,000, which includes a permitting budget along with plans, foundation, and delivery, compared to $309,000 for the Six Sixty. Exact permit costs are set by your city or county and confirmed in your feasibility study.

Which one delivers faster, the Four Fifty or the Six Sixty?

The Four Fifty has the shorter typical timeline at 4 months, compared to 5 months for the Six Sixty.

When should I choose the Four Fifty over the Six Sixty?

Choose the Four Fifty if you're working with a small lot, a first ADU, aging-in-place needs, or you simply want a private studio for one.

When should I choose the Six Sixty over the Four Fifty?

Choose the Six Sixty if you want rental income, a true separate bedroom, or a comfortable space for parents or adult children, it's Framework First's most popular model for a reason.

Studio vs One Bedroom, Entry ADUs

Four Fifty vs Six Sixty

The Four Fifty is a 450 square foot studio with one bathroom priced at $199,000, built in about 4 months. The Six Sixty is a 660 square foot one bedroom, one bathroom home priced at $309,000, built in about 5 months. Both share the same simple rectangle layout, but they answer different questions: one is about getting a private space up fast and affordably, the other is about building something that can carry rental income or house a loved one long term.

At a Glance

	Four Fifty	Six Sixty
Size	450 sq ft	660 sq ft
Bed / Bath	Studio / 1 Bath	1 Bed / 1 Bath
All-Inclusive Price*	$199,000	$309,000
Typical Delivery	4 months	5 months
Footprint Shape	Rectangular	Rectangular
Best For	First ADUs, small lots, aging-in-place, a private studio for one.	Rental income, parents, adult children: the all-rounder.

*Includes a permitting budget, not final permit costs. Permits and property-specific site work (septic, retaining walls, etc.) vary by property and are confirmed in your feasibility study. Every price also includes plans, foundation, the factory build, delivery, utility hookups, appliances, and final inspection.

Where the Four Fifty Wins

Pick the Four Fifty for this.

● Lowest entry price at $199,000
● Fastest build timeline, about 4 months
● Right sized for the smallest, tightest lots

Where the Six Sixty Wins

Pick the Six Sixty for this.

● 660 square feet with a true separate bedroom
● Framework First's most popular, all around model
● Built for rental income and multigenerational living

The Honest Verdict

How to actually decide.

If your lot is tight and you just need a private, no-frills space for one person, the Four Fifty gets you there quicker and for less. If you want a home with a real separate bedroom that can comfortably support a tenant, a parent, or an adult child, the Six Sixty is worth the extra investment.

Choose the Four Fifty if: Choose the Four Fifty if you're working with a small lot, a first ADU, aging-in-place needs, or you simply want a private studio for one.
Choose the Six Sixty if: Choose the Six Sixty if you want rental income, a true separate bedroom, or a comfortable space for parents or adult children, it's Framework First's most popular model for a reason.

BBBA+Google 4.9CSLB#1047146MFG#1595931Yelp5.0

Compare More

Other model comparisons.

Small Lots, Entry Models Four Fifty vs The 405 Studio Efficiency or a Real Bedroom? → Studio vs One Bedroom Four Fifty vs Five Five Five A Studio to Start, or a Real Bedroom? → One Bedroom, Two Sizes The 405 vs Five Five Five A Cozy Bedroom or Room to Breathe? → One Bed, One Bath, Two Sizes Five Five Five vs Six Sixty More Room to Breathe, or the All-Rounder Everyone Picks? → Same Footprint, One Bed or Two Six Sixty vs Six Sixty Duo One Bedroom or Two, Same 660 Square Feet? → Two Bedroom ADU Comparison Six Sixty Duo vs Seven Forty-Nine Compact and Efficient, or More Room to Spread Out? →

Form not loading? Open it directly →

Still Deciding?

See which one actually fits your lot: the Four Fifty or the Six Sixty.

Every property is different. Tell us your lot size, budget, and what you need the space for, and a real person on our team will tell you which model works, plus your exact price with permitting and site work factored in.

A shortlist of which models actually fit your lot
Honest flags on anything property-specific, like slope or septic
A clear next step, whether that is a factory tour or a feasibility study
No pressure, and no obligation

Once you submit, a real person on our team reviews your property and follows up within 1 to 2 business days to book your free 30-minute call. No call center, no drip campaign, just a conversation.

After we review your property, we'll invite you out to the factory, or send a member of our team to you, whichever fits your schedule better.

Building more than one? If you're a real estate developer or investor planning multiple units, let us know in the form. We offer better pricing at volume.

We respect your inbox and your phone. Message and data rates may apply, message frequency varies, reply STOP to opt out or HELP for help. See our Privacy Policy and Terms & Conditions.